Three-dimensional projective invariants of points from multiple images

Xiao, Chunxia; Li, Jianxun; Zhu, Zhengfu

doi:10.1117/1.3028347

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…The second method is phase error compensation by interpolation fitting and Look-Up Table (LUT). Chen, et al were proposed method adopts smoothing spline approximation to precisely extract the specific system phase error from the reference phase according to the system's phase distribution properties [10]. But the spline interpolation fitting is multiple iterations, and time-consuming is expensive.…”

Section: Introductionmentioning

confidence: 99%

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

Yang

Feng²,

Jiang³

et al. 2014

IJMUE

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Phase Shifting Profilometry is a method of structured light whose three-dimensional reconstructions are susceptible to error from Gamma distortion. In practice, the luminance nonlinearity caused by the Gamma distortion effect of a digital video projector and a digital camera yields undesired fringe intensity changes, which substantially reduce the measurement accuracy, and while the effects of the Gamma distortion diminish with an increasing number of employed phase-shifting patterns. A Gamma calibration method expressed as Fourier series and binomial series theorem is proposed to reduce the measurement error caused by the Gamma distortion. After Gamma calibration, the Gamma distortion effect is attenuated and the accuracy is enhanced. The linear least square is compensated the phase error of absolute phase still existing after Gamma calibration. To verify the presented method in this paper, a profilometry experimental system is constructed using digital video projector and CCD camera. The experiment results shown that, the Gamma calibration reduce the maximum phase error of absolute phase by 75.0%. After the linear least square compensation, the maximum phase error is only 5.9% of without any Gamma calibration or phase compensation. The reconstruction surface of a complex curve surface is hardly any waviness, which is clearly noted in the reconstruction of the same tested object without any correction or compensation.

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Section: Introductionmentioning

confidence: 99%

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

Yang

Feng²,

Jiang³

et al. 2014

IJMUE

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High-precision rotation angle measurement method based on monocular vision

Jin

Ling-na

2014

J. Opt. Soc. Am. A

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To accurately measure the attitude angles (pitch, roll, and yaw) of a rigid object that rotates in a space, we propose a high-precision rotation angle measurement method based on monocular vision. This method combines camera self-calibration, multiview geometry, and 3D measurement. This monocular vision measuring system consists of an area scan CCD, a prime lens, and a spots array target, which are fixed on the measured object. We can calculate the rotation angle according to the rebuilt rotating spots array target by using this monocular vision measuring system. The measurement precision of rotation angle can reach 1 arc sec in this paper's experiments. This method has high measurement precision and good stability. Therefore we can widely use this method in machinery manufacturing, engineering measurement, aerospace, and the military.

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Three-dimensional projective invariants of points from multiple images

Cited by 2 publications

References 15 publications

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

High-precision rotation angle measurement method based on monocular vision

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